Keyboard



FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a right side elevational view thereof.

The broken line showing of various regions in the Figures and the unshaded areas there within form no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 